In this article we present, in very general terms, the basic assumptions of the theoretical approach known as Construction Grammar (CG), and then we develop a detailed account of the analysis of the semantic and grammatical phenomenon known as aspectual coercion, from the standpoint of CG, and with reference to Spanish examples. We base this exposition in the proposal made in Michaelis (2004), because it stands out in terms of its thorough development and formal rigour.